Why Oppenheimer use black-and-white and color scenes? Oppenheimer directed by Christopher Nolan. Oppenheimer's cast including Cillian Murphy, Robert Downey Jr. as Lewis Strauss, Emily Blunt, Matt Damon, Florence Pugh, and many more. #oppenheimer #christophernolan #cilianmurphy #robertdowneyjr #emilyblunt #florencepugh #alberteinstein